Civil Engineering Reference
In-Depth Information
4. To verify mounting accuracy of the instruments mounting seats, which require
precise installation relative to the satellite axes, after dynamic loading.
The loads applied to the satellite strength mockup within the dynamic tests are
forced by the following ways:
1. Vibration loads are forced by shakers.
2. Shock environment is forced by actuating nominal pyrotechnic devices pow-
ered from special boards, which simulate components of onboard electrical
harness.
Scope of the dynamic tests is performed as follows:
1. Tests for case of road, rail, and air transportation.
2. Tests for case of launch using LV.
3. Tests for cases of Stage separation and Fairing jettison.
4. Tests for case of satellite separation.
5. Tests for case of release and deployment of solar arrays.
Visual inspection of the satellite strength mock-up is done after each test. Checks
of
stability
of
mounting
seats
for
instruments
according
to
instruction
and
inspection for defects of the Satellite Structure are performed.
6.2.3 Test Scheme
1. Tests start with environmental tests,
• Vibration tests of transportation using rail, motor, and air modes of transport;
• Determination of Transmissibility coefficients and natural frequencies of
satellite.
• Vibration strength tests for design case of injection of the satellite in orbit
using launch vehicle;
• Fairing drop and separation of LV third stage tests;
• Satellite separation from LV tests;
2. Functional Tests:
• Solar array panels unlocking and releasing tests.
• Structure integrity test (optical alignment) is carried out before and after each
test to make sure that the optical and sensors alignment are within the
accepted tolerance.
Strength mockup is fixed on vibration stand and control oscillator that controls
vibration loads. This control oscillator is located in a different room and controls
vibrations by averaging the output signal of four accelerometers, which are
attached to the technological bracket of vibration stand itself. Data from attached
accelerometers are recorded using data acquisition system, which is also located in
a different room. Test schedule is listed in Table
6.1
.
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